Cutting press



I P RCHER Jan.

CUTTING PRESS 3 Sheets-Shet 1 May 5 6 /mllllllllllllllllllllll lmk 1927"c. F. PARCHER CUTTING PRES S *Filed May 5, 1926 3 Sheets-Sheet 2 Jan.11, 1927.

c. F. PARCHER CUTTING PRESS Filed May 5, 1926 s sheets-sheet s PatentedJan. 11, 1927.

PATENT OFFICE.

CI-IABLY r, rARcHER, or riAroLEoN. OHIO.

currme rnnss' Application filed May 3,

My invention has for its object to provide a cutting press whereby asheet. material may be cut or punctured at a plurality' of points by theconsumption ofthe least amount of energy "or bythe use of the leastamount of change in the force required to cause the press to perform itsfunctions and without tearing or drawing 'the'mate'ri'al during thecutting operation. The invention is particularly applicable to cuttingor puncturing paper cardboard and composite paper board. WVhen used for.forming holes in composite board or corrugated board the machine willpuncture the holes without causing material permanent depres; sions inthe board about the edges'ofthe openings that are formed. The inventionalso has for itsobje'ctother advantages and features which are-describedhereinafter and will appear upon examination of the draw ings.

The invention may be contained in punch presses of different forms forpunching slieet material of different" kinds to be used for differentpurposes and to illustrate a practical application of the invention Ihave selected a structure as an example of "structures that contain theinvention and shall describe it hereinafter. The structure 5 selected'is shown in the accompanying drawings.

Figure 1 is a perspective View of the cutting press. Fig. 2 is aperspective view of one of the punches. Fig. 3 is a view of a cuttingdie that cooperates with one of the punches to formopeningsinsheet'imaterial. Fig. 4c is a side View of the curring pressshown in Fig. 1 and Fig. -5is an end view of the cutting press. Fig. 6is a broken view illustrating the'lnanner in which the parts areconnected to the plunger member. Fig. 7 is a view of a section of apartof the press taken on the plane of the line 77 indicated in Fig. 4. Fig.8 is'a top view of the bed plate of the press and Fig. 9 is aperspective 'view'of a composite board that has been punctured by thepress;

In the form of construction shown, in the drawings, the press 1 is"supporte'd on any. suitable standard in order, to" position 1926.Serial No. 106,190.

' 7. The lowerendsof the links are'pivotally supported onan arm 8 thatis bolted to the top of thegoose neck 3 and is held firmly by aninwardly extending ridge 9 as against movements that would ordinarily beproduced by the pressure'transmitted from the lever 6' throughthelinksf. Theouter end of the lever '6 is connected by means of a link'10 to a leverlll- The lever 11 is piv- ,oted to a frame or thesupporting standard of the bed and terminates in the pedal 12. When;therefore; it is desired to depress the plunger ante pedal 12 is pressedby the foot andthe movement is transmitted through the levers 6 and 11to the plunger 5. It is raisedby'the spring 13.

A- press plate 15 is connected to the plunger It'has a'plurality ofopenings 16 in which are located punches 17 that are suitablyshouldei'ed as at 18 in order to engage 'thelower surface of the pressplate and be held in properposition relative to the press plate duringthe operations of the plunger. The punches 1 7 7 have cutting edges thatare located in planes that are positioned at airangle other than a rightangle to the axis of each punch. The surfaces of theend portion of'thepunches are cylindrical in form and;consequently the edges 19" of thepunches are elliptical in form. Also the end 20' of each punch" isconcave. It preferably conforms to a section of a sphere which producesin exceedingly sharp edge forcuttingthe sheet material and is )arti-ciilarly of advantage where the press is us'ed incutting compositepaperboardto avoid permanently depressing the edge portions that-farelocated about the openings that may be'produc'ed. 'The'location offthelowermost pointsofthe edges of the punches are arranged symmetricalwith"resp ect to each "other; and i so that "the shearing action It hasthe of the one-half of the punches will be towards the other half of thepunches as well as downward, that is, the edges of the punches beinginclined with respect to the vertical, the pressure of the sheetmaterial is not only vertical, but slightly lateral and the punches areso arranged that this lateral pressure produced by each punch will beoffset by the lateral pressure produced by the other punches. Thisprevents shifting of ;he sheet material operated on. The punches arethus arranged so that the lowermost points of one-halfof the punches arelocated on the same side with respect to the sides of the press, and thelowermost points of the other one-half of the punches are located on theopposite side preferably the punches are divided into two groups and thesame rule as to location of the lowermost point of the punches isfollowed in locating the relative punches of the lowermost points oftheir edges. 'Furthermore, the lowermost points of the edges of thepunches are located in stepped relation with respect to the direction ofmovement of the plate in which they are located. Consequently when theplunger is depressed the punches will engage the paper in the order inwhich the lowermost point of their edges are located with reference tothe bed plate of the press, and there will be a sequential operation ofthe punches. Thus when the plunger is depressed the punches will engageone after the other, so that the resistance to the movement of the pedalwhich produces the downward movement of the plunger will besubstantially uniform. Where the sheet material is to be engaged, thatis, cut or formed, in the central portion, while the material is to beengaged, that is, cut or formed, exterior to the central portion, it ispreferable to locate the outer punches or dies more remote from the bedplate than the punches or dies that opcrate on the sheet material atpoints in the central portion since the central punches or dies willengage the sheet material and hold the sheet material in position whilethe outer punches or dies are operating. In the particular form ofconstruction shown the punches are divided into two groups and a numberof the punches are located centrally with respect to the punches in eachof the groups, the outer punches bcin g located more remote from thebcl. plate than the central punches with respect to each group. Alsosince the punches engage sequentially the sheet material will be held.in position by the punches that first engage the sheet material whilethe other punches are engaging the sheet material. Thus the materialwill be securely held in position during the downward stroke of theplunger.

Any number of the punches may be used in the press. In the arrangementshown four punches are located in two rows and two punches are locatedin the central row but any number of these punches may be re moved inorder to form holes at desired distances apart and in order to formdesired groupings of the punches, that is, desired arrangement of theopenings that are formed in the sheet material. In order that the sheetmaterial 24L may be engaged in advance of the engagement by the punches,a plate25 is supported by means of rods 26 below the edges of thepunches. Springs 27 are located on the rods 26 to elastically press theplate against the heads 28 of the rods. Consequently as the plunger isdepressed, the plate 25 will be pressed against the sheet material andthe punches will follow while the springs 27 are being compressed.Openings 29 are formed in the plate 25 through which the punches pass toengage the sheet material 24.

The bed plate 30 is located on the bed 2 and may be secured in positionby means of key bolts 31 that extend through flanges 32 located atopposite ends of the bed plate 30.

The bed plate 30 is provided with a plurality of cutting dies or rings33. The cutting dies are substantially cylindrical in form and fit intocylindrical openings that are formed in the bed plate 30. Suitableshoulders 34 are formed for securing the dies 33 in position. Each die33 has a conical interior surface 35 and a conical exterior surface orend surface 36 that form the edge 37 where they meet. The diameter ofthe edge 37 is substantially the same as the diameter of the cylindricalsurface of each punch 17 and consequently the two sharp cutting edges 19of the punch and 37 of the cutting die operate to shear the sheetmaterial when the plunger is depressed. By reason of the formation ofthe edges of the punches and the cutting dies, the material of thecharacter of composite board may be readily out without causingpermanent deformation of the board which is very advan tageous when thecomposite board is used for certain purposes. Furthermore, the edgesbeing formed as described, an eflicient shearing operation is producedwhichprevents tearing of the sheet material not only at points where thematerial is being cut, but also prevents tearing or straining of thematerial between the points at which it is being cut by the bunches.Consequently when the press operates upon the sheet material, there isno creeping of the material nor of parts of the sheet material whichcauses deformation of the sheet material.

I claim:

In acutting press, a plurality of cylindrica'l punches having ellipticalcutting edges formed by the intersection of the cylindrical surface ofeach punch and a concave end surface, the lowermost points of one halfof the number of punches being located on one side, with respect to thesides of the press, and the other half located on the other side, andthe lowermost points of the punches located in stepped relation to eachother with reference to the direction of the cutting movement of thepress, one ofthe punches located centrally with respect to the other ofthe punches and having the 10 lowermost point of its edge located lowestwith respect to the stepped relation of the edges of the punches.

In testimony whereof I have hereunto signed my name to thisspecification.

CHARLY F. PAROHER.

